U.S. patent number 9,915,479 [Application Number 15/234,752] was granted by the patent office on 2018-03-13 for heat storage type combustion system equipped with disk type distributor having excellent sealing.
This patent grant is currently assigned to Kumho Environment Co., Ltd.. The grantee listed for this patent is Seung Wook Choi, Kumho Environment Co., Ltd.. Invention is credited to Seung Wook Choi.
United States Patent |
9,915,479 |
Choi |
March 13, 2018 |
Heat storage type combustion system equipped with disk type
distributor having excellent sealing
Abstract
A heat storage type combustion system equipped with a disk type
distributor having improved sealing according to the present
invention, the system includes: the distributor having a rotary
distribution unit, a lower distribution unit located on the
underside of the rotary distribution unit, an upper distribution
unit located on the top of the rotary distribution unit, and a
plurality of dumb buckles disposed equally spaced apart from each
other along outer circumferential rims of the lower distribution
unit and the upper distribution unit to fix the lower distribution
unit and the upper distribution unit to each other. Each dumb
buckle includes a left-handed screw and a right-handed screw formed
on both end portions around the body thereof in such a manner as to
be tightened or loosened repeatedly if necessary, and the number of
dumb buckles is 4 to 12 in accordance with the sizes of the
distributor. The state of the operating distributor is checked by
naked eyes, and if the distributor is inclined or a given portion
of the distributor is worn out, the distributor is returned to its
normal state by means of the manipulations of the dumb buckles at
the outside.
Inventors: |
Choi; Seung Wook (Seongnam
Gyeonggi-do, KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
Choi; Seung Wook
Kumho Environment Co., Ltd. |
Seongnam, Gyeonggi-do
Seongnam-si, Gyeonggi-do |
N/A
N/A |
KR
KR |
|
|
Assignee: |
Kumho Environment Co., Ltd.
(Seongnam-si, Gyeonggi-do, KR)
|
Family
ID: |
58097751 |
Appl.
No.: |
15/234,752 |
Filed: |
August 11, 2016 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20170059255 A1 |
Mar 2, 2017 |
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Foreign Application Priority Data
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Aug 28, 2015 [KR] |
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10-2015-0121396 |
Jul 27, 2016 [KR] |
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10-2016-0095136 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F23J
15/00 (20130101); F23G 7/06 (20130101); F28D
17/04 (20130101); F28D 19/044 (20130101) |
Current International
Class: |
F23L
15/02 (20060101); F28D 19/04 (20060101) |
Field of
Search: |
;165/8 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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101011361 |
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Jan 2011 |
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KR |
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101029867 |
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Apr 2011 |
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KR |
|
Primary Examiner: Hwu; Davis
Attorney, Agent or Firm: Kim Winston LLP
Claims
What is claimed is:
1. A heat storage type combustion system equipped with a disk type
distributor 200 having improved sealing, the system comprising: the
distributor 200 having a rotary distribution unit 21, a lower
distribution unit 22 located on the underside of the rotary
distribution unit 21, an upper distribution unit 23 located on the
top of the rotary distribution unit 21, and a plurality of dumb
buckles 70 disposed equally spaced apart from each other along
outer circumferential rims 221 and 231 of the lower distribution
unit 22 and the upper distribution unit 23 to fix the lower
distribution unit 22 and the upper distribution unit 23 to each
other.
2. The heat storage type combustion system according to claim 1,
wherein each dumb buckle 70 comprises a left-handed screw and a
right-handed screw formed on both end portions around the body
thereof and the number of dumb buckles 70 is 4 to 12 in accordance
with the sizes of the distributor 200.
3. The heat storage type combustion system according to claim 2,
wherein each dumb buckle 70 further comprises fixing bolts adapted
to prevent the dumb buckle 70 from being tightened or loosened
spontaneously.
4. The heat storage type combustion system according to claim 3,
wherein said each dumb buckle 70 further comprises assembly bolts,
a first pair of assembly bolts being adapted to fix the outer
circumferential rim 231 of the upper distribution unit 23 thereto
and a second pair of assembly bolts being adapted to fix the outer
circumferential rim 221 of the lower distribution unit 22
thereto.
5. The heat storage type combustion system according to claim 3,
wherein the end portion of the right-handed screw 72 of said each
dumb buckle 70 is fixedly welded to the outer circumferential rim
231 of the upper distribution unit 23 and otherwise the end portion
of the left-handed screw 75 of each dumb buckle 70 is fixedly
welded to the outer circumferential rim 221 of the lower
distribution unit 22.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims foreign priority to Korean Patent
Application No. KR10-2016-0095136, filed Jul. 27, 2016, and Korean
Patent Application No. KR10-2015-0121396, filed Aug. 28, 2015, the
entire disclosures of which are incorporated by reference herein in
their entirety.
FIELD OF THE INVENTION
The present invention relates to a heat storage type combustion
system, which is called `rotary regenerative thermal oxidizer RTO`,
and more particularly, to a heat storage type combustion system
equipped with a disk type distributor having improved sealing.
BACKGROUND OF THE RELATED ART
Different kinds of harmful gases including volatile organic
compounds VOCs are produced in various industrial fields, and they
cause all kinds of environmental problems. Under the regulation of
governments of many countries, accordingly, harmful components of
the gases are forcedly removed and discharged to the air. The
present invention relates to a combustion system that burns harmful
and odorous gases and removes harmful components from the
gases.
The combustion system is configured wherein harmful gases are
introduced into a combustion chamber and they are ignited by the
fuel injected from a fuel injection device disposed on one side of
the combustion chamber, so that they are burnt to remove harmful
components therefrom.
As one of conventional combustion systems, on the other hand, a
heat storage type combustion system is provided wherein a heat
storage structure is disposed in a combustion chamber so that high
thermal energy of burnt gas is transmitted to the heat storage
structure and the harmful gases introduced into the heat storage
structure is pre-heated in the heat storage structure, thereby
enhancing the combustion efficiency of the harmful gases. The
conventional heat storage type combustion system includes the
combustion chamber adapted to burn the harmful gases together with
fuel and having the heat storage structure disposed in the interior
thereof and a distributor adapted to supply the harmful gases to
the interior of the combustion chamber and to discharge the burnt
gases therefrom.
According to conventional technologies on the distributor, the
distributor is largely classified into a drum type distributor and
a disk type distributor. The disk type distributor has a large size
and is made by means of casting so as to resist a high temperature
generated by combustion heat, so that it has a large weight. In the
process of rotating the large-sized distributor, accordingly, many
problems may occur. In case of the drum type distributor, on the
other hand, a drum is thermally expanded by the high temperature
generated by combustion heat to cause troubles in the operation of
the system, so that fire may occur.
A heat storage type combustion system having a dual disk type
distributor is disclosed in Korean Patent No. 1011361 as issued to
the same applicant as this invention. Besides, another heat storage
type combustion system is disclosed in Korean Patent No. 1029867 as
issued to the same applicant as this invention, wherein a portion
of burnt gas in the combustion system as disclosed in Korean Patent
No. 1011361 is collected to a combustion chamber. This invention
relates to the two prior arts and is applicable to the heat storage
type combustion systems of the two prior arts as well as to all
kinds of heat storage type combustion systems having disk type
distributors.
In case of the heat storage type combustion system having a dual
disk type distributor, it is found that if the system operates for
a long period of time, the distributor may be twisted or the
circumferential portion of the distributor may be worn out. If so,
the sealing of the distributor is not obtained fully. That is,
gases leak from the interior of the distributor, thereby failing to
achieve perfect purification through combustion of harmful
gases.
As shown in FIG. 1, the heat storage type combustion system is
configured to have a distributor 200 disposed under a combustion
chamber 100 in such a manner as to supply harmful gases to the
combustion chamber 100 and to discharge burnt gases to the outside.
As shown in FIG. 3, the distributor 200 includes a rotary
distribution unit 21 conducting a rotary motion and upper and lower
distribution units 23 and 22 located on the top and underside of
the rotary distribution unit 21 in such a manner as to sealingly
come into contact with the rotary distribution unit 21. As shown in
FIG. 5, the upper and lower distribution units 23 and 22 are
fixedly located to the distributor 200 as a part of a distributor
body. However, the rotary distribution unit 21, which is located
between the lower distribution unit 22 and the upper distribution
unit 23, rotates at a given speed. Generally, time of about 20
seconds to 2 minutes is consumed for one rotation of the rotary
distribution unit 21. The rotary distribution unit 21 is supported
against a shaft 50, and the shaft 50 is coupled to a gear motor 300
in such a manner as to rotate at a given speed. While the rotary
distribution unit 21 is rotating, the top circumference thereof
comes into contact with the underside circumference of the upper
distribution unit 23 and the underside circumference thereof comes
into contact with the top circumference of the lower distribution
unit 22. Accordingly, grease is supplied to the circumferences
coming into contact with each other to minimize the wearing on the
circumferences of the respective distribution units caused by their
friction. In spite of the supply of grease, the rotary distribution
unit 21 is kept rotating during the operation of the combustion
system, so that the top or underside circumference of the rotary
distribution unit 21, the underside circumference of the upper
distribution unit 23, and the top circumference of the lower
distribution unit 22 are worn out by means of their friction. As a
result, the rotary distribution unit 21 may be twisted, or a gap
occurs due to partial abrasion of the circumference, so that gases
are emitted to the outside from the interior of the distributor 200
through the gap. If the gases are emitted to the outside from the
distributor 200, the operation of the combustion system stops and
repairing starts. If the partial abrasion of the circumferences of
the distribution units becomes serious, the combustion system is
disassembled to exchange the twisted or abraded rotary distribution
unit 21, lower distribution unit 22 and/or upper distribution unit
23 with new ones. It is not easy to conduct such repairing in the
combustion system, and during the repairing, also, since the
combustion system cannot operate, the harmful gases generated
therein are not treated at a proper time. Generally, the diameter
of the distributor 200 is more than 2 m, and accordingly, it is not
simple to conduct the disassembling of the combustion system or the
exchanging work of the distribution units.
If the partial abrasion of the rotating rotary distribution unit 21
and the partial abrasion of the lower distribution unit 22 and the
upper distribution unit 23 coming into contact with the rotary
distribution unit 21 are all prevented to achieve uniform abrasion,
the lower distribution unit 22 or the upper distribution unit 23
coming into contact with the rotary distribution unit 21 can
prevent the harmful gases from leaking to the outside of the
distributor 200.
So as to solve the above-mentioned problems, the present invention
suggests a new heat storage type combustion system that easily
adjusts a twisted or abraded distributor having bad sealing only
with a simple device. According to the present invention, while the
combustion system is continuously operating, without stopping, the
distributor having bad sealing can be simply adjusted.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made in view of the
above-mentioned problems occurring in the prior art, and it is an
object of the present invention to provide to a heat storage type
combustion system equipped with a disk type distributor having
improved sealing.
It is another object of the present invention to provide to a heat
storage type combustion system equipped with a disk type
distributor having improved sealing that can simply adjust a
twisted or abraded distributor having bad sealing caused by the
operation of the combustion system for a long period of time.
It is yet another object of the present invention to provide to a
heat storage type combustion system equipped with a disk type
distributor having improved sealing that can conduct a repairing or
exchanging operation for the distributor, without stopping the
operation of the combustion system.
It is still another object of the present invention to provide to a
heat storage type combustion system equipped with a disk type
distributor having improved sealing that can check a repairing or
exchanging situation by naked eyes upon a repairing or exchanging
operation, while the combustion system is continuously
operating.
To accomplish the above-mentioned objects, according to the present
invention, there is provided a heat storage type combustion system
equipped with a disk type distributor having improved sealing, the
system including: the distributor having a rotary distribution
unit, a lower distribution unit located on the underside of the
rotary distribution unit, an upper distribution unit located on the
top of the rotary distribution unit, and a plurality of dumb
buckles disposed equally spaced apart from each other along outer
circumferential rims of the lower distribution unit and the upper
distribution unit to fix the lower distribution unit and the upper
distribution unit to each other.
According to the present invention, preferably, each dumb buckle
includes a left-handed screw and a right-handed screw formed on
both end portions around the body thereof in such a manner as to be
tightened or loosened repeatedly if necessary, and the number of
dumb buckles is 4 to 12 in accordance with the sizes of the
distributor.
According to the present invention, preferably, the state of the
operating distributor is checked by naked eyes, and if the
distributor is inclined or a given portion of the distributor is
worn out, the distributor is returned to its normal state by means
of the manipulations of the dumb buckles at the outside.
According to the present invention, preferably, the plurality of
dumb buckles are disposed equally spaced apart from each other
along outer circumferential rims of the lower distribution unit and
the upper distribution unit to fix the lower distribution unit and
the upper distribution unit to each other, so that the distance
between the lower distribution unit and the upper distribution unit
is constantly maintained and the top and underside circumferences
of the rotary distribution unit are uniformly worn out, thereby
generating no gap caused by partial abrasion. As a result, the
sealing of the distributor is enhanced, which prevents the gases
existing in the distributor from leaking to the outside.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and advantages of the present
invention will be apparent from the following detailed description
of the preferred embodiments of the invention in conjunction with
the accompanying drawings, in which:
FIG. 1 is a schematic view showing a configuration of a
conventional heat storage type combustion system having a disk type
distributor;
FIG. 2 is a schematic view showing a heat storage type combustion
system equipped with a disk type distributor having improved
sealing according to the present invention, wherein the outer
circumferential rims of a lower distribution unit and an upper
distribution unit of the distributor are fixed to each other by
means of a plurality of dumb buckles;
FIG. 3 is a schematic exploded perspective view showing a
conventional combustion system distributor having a rotary
distribution unit, a lower distribution unit, and an upper
distribution unit;
FIG. 4 is a schematic partial perspective view showing the heat
storage type combustion system equipped with a disk type
distributor having improved sealing according to the present
invention, wherein the outer circumferences of the lower
distribution unit and the upper distribution unit of the
distributor are fixed to each other by means of the plurality of
dumb buckles;
FIG. 5 is a schematic sectional view showing the heat storage type
combustion system equipped with a disk type distributor having
improved sealing according to the present invention, wherein the
outer circumferences of the lower distribution unit and the upper
distribution unit of the distributor are fixed to each other by
means of the plurality of dumb buckles;
FIG. 6 is a schematic perspective view showing an example of the
dumb buckle adopted in the present invention; and
FIG. 7 is a schematic perspective view showing another example of
the dumb buckle adopted in the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention relates to a heat storage type combustion
system, which is called `rotary regenerative thermal oxidizer RTO`,
and more particularly, to a heat storage type combustion system
equipped with a disk type distributor having improved sealing.
FIG. 1 is a schematic view showing a configuration of a
conventional heat storage type combustion system having a disk type
distributor. As mentioned above, the heat storage type combustion
system is disclosed in Korean Patent No. 1011361 and Korean Patent
No. 1029867, and first, an explanation on the conventional heat
storage type combustion system will be schematically given.
As shown in FIG. 1, the heat storage type combustion system
includes the combustion chamber 100 adapted to burn harmful gases
and the distributor 200 located under the combustion chamber 100 to
introduce the harmful gases into the combustion chamber 100 and to
discharge the harmful gases burnt in the combustion chamber 100 to
the outside therefrom, and the distributor 200 includes the upper
distribution unit 23 and the lower distribution unit 22 around the
rotary distribution unit 21. Further, the gear motor 300 is located
under the distributor 200 to supply power for rotating the rotary
distribution unit 21.
Under the conventional heat storage type combustion system having
the disk type distributor, the harmful gases are introduced into
the system through an inlet pipe 41 and then supplied to the
combustion chamber 100 via the distributor 200 by means of a blower
(not shown). The harmful gases passing through a heat storage
material 11 disposed in the combustion chamber 100 are distributed
to the space above the heat storage material 11 and then burnt by
means of a torch 12 disposed in the combustion chamber 100. The
gases burnt by means of the torch 12 are discharged to an outlet
pipe 43 via the heat storage material 11 and the distributor 200. A
portion of gases burnt in the combustion chamber 100 is discharged
directly to the outside through a discharge hole 13 formed on the
upper portion of the combustion chamber 100, thereby preventing the
temperature of the combustion chamber 100 from being more than an
operating temperature of the system to avoid the overheating of the
combustion chamber 100.
Under the conventional heat storage type combustion system having
the disk type distributor, further, a purge gas is injected into
the heat storage material 11 to prevent sludge or materials having
explosion risks like methane formed in the heat storage material 11
from being concentrated, so that the combustion system can operate
in the similar environment to that when initially installed. The
purge gas is injected through a purge pipe 42 and the distributor
200 into the heat storage material 11 of the combustion chamber
100.
According to the present invention, on the other hand, a heat
storage type combustion system equipped with a disk type
distributor having improved sealing is configured wherein the
distributor 200 includes a rotary distribution unit 21, a lower
distribution unit 22 located on the underside of the rotary
distribution unit 21, an upper distribution unit 23 located on the
top of the rotary distribution unit 21, and a plurality of dumb
buckles 70 disposed equally spaced apart from each other along
outer circumferential rims 221 and 231 of the lower distribution
unit 22 and the upper distribution unit 23 to fix the lower
distribution unit 22 and the upper distribution unit 23 to each
other.
FIG. 2 is a schematic view showing a heat storage type combustion
system equipped with a disk type distributor having improved
sealing according to the present invention, wherein the outer
circumferential rims 221 and 231 of the lower distribution unit 22
and the upper distribution unit 23 of the distributor 200 are fixed
to each other by means of the plurality of dumb buckles 70.
The lower distribution unit 22 and the upper distribution unit 23
of the distributor 200, which are fixed to each other by means of
the dumb buckles 70 adopted in the present invention, are shown in
FIG. 3. FIG. 3 is a schematic exploded perspective view showing a
conventional combustion system distributor having a rotary
distribution unit, a lower distribution unit, and an upper
distribution unit. The conventional combustion system distributor
as shown in FIG. 3 is disclosed in Korean Patent No. 1011361. As
shown in FIG. 3, the distributor 200 in which the dumb buckles 70
according to the present invention are adopted includes the rotary
distribution unit 21, the lower distribution unit 22, and the upper
distribution unit 23. The lower distribution unit 22 and the upper
distribution unit 23 are fixedly located to the distributor 200 as
a part of a distributor body, and the rotary distribution unit 21
rotates at a given speed. The rotary distribution unit 21
continuously comes into close contact with the upper distribution
unit 23 and the lower distribution unit 22 even during the rotation
thereof, thereby preventing the harmful gases from leaking to other
regions.
The rotary distribution unit 21 is supported against the shaft 50,
and the shaft 50 is coupled to the gear motor 300 in such a manner
as to rotate at a given speed. While the rotary distribution unit
21 is rotating, the top circumference thereof comes into contact
with the underside circumference of the upper distribution unit 23
and the underside circumference thereof comes into contact with the
top circumference of the lower distribution unit 22. Accordingly,
grease is supplied to the circumferences coming into contact with
each other to minimize the wearing on the circumferences of the
respective distribution units caused by their friction. In spite of
the supply of grease, the rotary distribution unit 21 is kept
rotating during the operation of the combustion system, so that the
top or underside circumference of the rotary distribution unit 21,
the underside circumference of the upper distribution unit 23, and
the top circumference of the lower distribution unit 22 are worn
out by means of their friction. As a result, the rotary
distribution unit 21 may be twisted, or a gap occurs due to partial
abrasion of the circumferences of the respective distribution
units, so that gases are emitted to the outside from the interior
of the distributor 200 through the gap. If the gases are emitted to
the outside from the distributor 200, the operation of the
combustion system stops and repairing starts. If the partial
abrasion of the circumferences of the distribution units becomes
serious, the combustion system is disassembled to exchange the
twisted or abraded rotary distribution unit 21, the lower
distribution unit 22 and/or the upper distribution unit 23 with new
ones.
It is not easy to conduct such repairing in the combustion system,
and during the repairing, also, since the combustion system cannot
operate, the harmful gases generated therein are not treated at a
proper time. Accordingly, the heat storage type combustion system
according to the present invention is proposed to solve the
above-mentioned problems.
FIG. 4 is a schematic partial perspective view showing the heat
storage type combustion system according to the present invention,
wherein the outer circumferences of the lower distribution unit 22
and the upper distribution unit 23 of the distributor 200 are fixed
to each other by means of the plurality of dumb buckles 70. Each
dumb buckle 70 has a left-handed screw and a right-handed screw
formed on both end portions around the body thereof in such a
manner as to be tightened and loosened repeatedly if necessary. The
dumb buckles 70 are equally spaced apart from each other along the
outer circumferences of the lower distribution unit 22 and the
upper distribution unit 23, and for example, the number of dumb
buckles 70 is 4 to 12 in accordance with the sizes of the
distributor 200. Referring to FIG. 4, the outer circumferences of
the lower distribution unit 22 and the upper distribution unit 23
are fixed to each other by means of 12 dumb buckles 70. Of course,
fixing of the lower distribution unit 22 and the upper distribution
unit 23 to each other along the outer circumferential rims 221 and
231 by means of the dumb buckles 70 is easily carried out by the
person skilled in the art.
Each dumb buckle 70 has the left-handed screw and the right-handed
screw formed on both end portions around the body thereof in such a
manner as to be tightened or loosened repeatedly if necessary, and
accordingly, the inclined state or the abraded state of the
distributor 200 is checked by naked eyes, so that the dumb buckles
70 are adjustably turned to left or right. Of course, such
adjustment through the dumb buckles 70 is easily carried out by the
person skilled in the art. According to the present invention, if
it is checked by naked eyes that the distributor 200 has been
inclined or a given portion of the distributor 200 has been worn
out, the dumb buckles 70 are manipulated at the outside and
adjusted to a normal state, without stopping the operation of the
combustion system.
FIG. 5 is a schematic sectional view showing the heat storage type
combustion system according to the present invention, wherein the
lower distribution unit 22 and the upper distribution unit 23 of
the distributor 200 are fixed to each other by means of the
plurality of dumb buckles 70. FIG. 6 is a schematic perspective
view showing an example of the dumb buckle of FIG. 5.
Each dumb buckle 70 includes a right-handed screw 72, a left-handed
screw 75, adjusting means 71 connected to the right-handed screw 72
and the left-handed screw 75, assembly bolts 73, 74, 76 and 77, and
fixing bolts 78 and 79. The assembly bolts 73 and 74 are adapted to
fix the outer circumferential rim 231 of the upper distribution
unit 23 thereto, and the assembly bolts 76 and 77 are adapted to
fix the outer circumferential rim 221 of the lower distribution
unit 22 thereto. Instead of the assembly bolts 73, 74, 76 and 77,
any one of the outer circumferential rims 231 and 221 may be welded
to the dumb buckles 70, and in this case, the other circumferential
rim is assembled to the dumb buckles 70 by means of the assembly
bolts 73 and 74 or 76 and 77. If the adjusting means 71 is turned
to left and right, the length of the dumb buckle 70 is adjustable.
The fixing bolts 78 and 79 serve to prevent the dumb buckle 70 from
being tightened or loosened spontaneously. The dumb buckles 70 may
be tightened or loosened spontaneously because the rotary
distribution unit 21 is kept rotating, and so as to avoid such
problems, accordingly, the heat storage type combustion system
according to the present invention further has the fixing bolts 78
and 79.
FIG. 7 is a schematic perspective view showing another example of
the dumb buckle adopted in the present invention. As shown in FIG.
7, a dumb buckle 80 includes a right-handed screw 82 and a
left-handed screw 83 formed unitarily with each other and adjusting
means 81 fitted to the center of the right-handed screw 82 and the
left-handed screw 83. If the adjusting means 81 is turned to left
and right, the length of the dumb buckle 80 is adjustable. Further,
the dumb buckle 80 includes coupling members 84 and 85 and fixing
bolts 86 and 87. The coupling members 84 and 85 are assembled to
the outer circumferential rims 231 and 221 through assembly bolts
(not shown), and the fixing bolts 86 and 87 prevent the dumb buckle
80 from being tightened or loosened spontaneously.
As described above, the heat storage type combustion system
equipped with the disk type distributor having improved sealing can
simply adjust the twisted or abraded distributor having bad sealing
caused by the operation of the combustion system for a long period
of time, conduct repairing or exchanging operation for the
distributor, without stopping the operation of the combustion
system, and check a repairing or exchanging situation by naked eyes
upon the repairing or exchanging operation, while the combustion
system is continuously operating.
While the present invention has been described with reference to
the particular illustrative embodiments, it is not to be restricted
by the embodiments but only by the appended claims. It is to be
appreciated that those skilled in the art can change or modify the
embodiments without departing from the scope and spirit of the
present invention.
* * * * *